NY/T 1574-2007 Leguminous forage hay quality grading NY/T1574-2007 standard download decompression password: www.bzxz.net
This standard specifies the quality inspection method, grading standard, identification rules and labeling of leguminous forage hay. This standard is applicable to leguminous forage products such as alfalfa, Astragalus adansinoides, Achyranthes bidentata and red clover.

ICS 65.120
Agricultural Industry Standard of the People's Republic of China
NY/T 1574—2007
Quality Grading of Legume Hay
Rules for quality grading of legume hayPublished on 2007-12-18
Implemented on 2008-03-01
Published by the Ministry of Agriculture of the People's Republic of China
This standard was proposed by the Department of Agriculture and Animal Husbandry of the People's Republic of China. This standard is under the jurisdiction of the National Animal Husbandry Standardization Technical Committee. NY/T1574-2007
The drafting units of this standard are: National Animal Husbandry Station, National Grassland Product Quality Supervision and Inspection and Testing Center of the Ministry of Agriculture, Inner Mongolia Agricultural University, Hsu Agricultural University, China Agricultural University:
The main drafters of this standard are: Yu Ming, Ma Jinxing, Yin Xiaofei, Jia Yushan, Jiang, Wang Pinwen, Yang Qingfeng, Li Cunfu, Li Yurong, Liu Fang, Ren Shouding.
1 Scope
Quality grading of leguminous forage and grass
This standard specifies the quality testing methods, grading standards, identification rules and labels of leguminous forage and grass: This standard is applicable to leguminous forage products such as sedge, sand grass, sainfoin and red clover. 2 Normative references
NY/T 1574-2007
The clauses in the following documents become the clauses of this standard through reference in this standard. For dated references, all subsequent amendments (excluding errata) or revisions are not applicable to this standard. However, parties to agreements based on this standard are encouraged to study whether the latest versions of these documents can be used. For undated references, the latest versions apply to this standard. GB/T6432 Determination of crude protein content in feeds GB/T 6435 Determination of moisture in feeds
GR/T6438 Determination of crude ash in feeds GB/T6682 Specifications and test strips for water used in analytical laboratories GB/T4699.1 Feed sampling
GB/T20806 Determination of neutral detergent fiber (X1F) in feeds 1Y/T1459 Determination of acidic detergent fiber in feeds 3 Terms and definitions
The following terms and definitions apply to this standard. 3.1
Leguminous forage hay
Leguminous forage hay products that have been harvested in time and then artificially harvested, sun-dried or shade-dried: 3.2
Weeds
Other plants in the hay other than the target plants. 3.3
Leave weight
The total weight of the leaves of the leguminous forage, including the leaves and petioles. 3.4
Harvest period
The growth and development period of the hay at the time of harvesting. 3.5
Foreign material
Matter that is useless or detrimental to the characteristics of the hay, such as iron, stone, plastic, fiber, etc. 3.6
additive material
additive
substances such as desiccant and preservative added to maintain or improve the properties of hay; 3.7
NY/T1574--2007
batch of hay
batch of hay within the specified weight with the same species (variety), plot, growth period, harvest time and specification, and basically the same quality; 3.8
sensory index
the provisions on the color, odor, exo-ane properties, etc. of the raw materials or finished products of Zhuo granules; 3.9
primary sample
part of the hay sampled from the place of approval; 3.10
submitted sample
sample submitted to the inspection station.
moisture
The mass lost by drying the sample at 100%~105℃ to constant weight. 3. 12
crude protein (CP)
Crude protein
The nitrogen and oxygen content in the sample multiplied by 6.25, including pure protein and hydride. 3.13
Neutral detergent fiber (NDF) The general term for the insoluble substances remaining after the fat, starch, protein and sugar components in the feed are removed by neutral detergent. 3.14
Acid detergent fiber (ADF) The general term for the insoluble substances remaining after the fat, starch, protein and sugar components in the feed are removed by acid detergent. 3.15
β-caroteneβ- carotene
Precursor of vitamin A, a kind of carotene formed by the polymerization of 8 isoprene3.16
crude ash ash
The residue after the sample is burned at 550℃,
4 Technical requirements
4.1 Sensory quality indicators and classification
The sensory and physical indicators of the product shall meet the requirements of Table 1. Table 1 Sensory and physical indicators and classification of leguminous forage hay quality
Harvest time
Leaf quantity, secondary
Weeds,
Aroma
Appearance period
n---6C
Flowering period
49--3n
Early fruiting period
29-~20
Fruit bearing period
Water quantity, environment
4.2 Chemical quality indicators and classification
13 ~-15
The chemical indexes of the product shall meet the requirements of Table 2 Table 1 (Continued)
19~-20
Table 2 Chemical indexes and graded indexes of leguminous forage hay quality
Crude protein, %
Neutral detergent fiber, %
Acidic detergent fiber, %
Bottle ash, %
β-carotene, mg/kg
Note: All physical and chemical indexes are calculated on the basis of 86% of the substance below 4.3 Additives
The added substances shall be described in pairs. Indicate the name and quantity of the additives, etc. 5. Testing methods
5.1 Sampling
5.1.1 Division of hay batches
NY/T15742007
One inspection sample is taken from each batch of hay: the maximum number of hay batches is not more than 50 t, and less than 50 t is counted as one batch. If different piles with obvious differences due to different storage conditions, etc. should be divided into batches separately, 5.1.2 Determination of the number of initial samples
According to the provisions of GB/T11699.1.
5. 1. 3 Sampling methods
Use a sampling tool to randomly sample different parts of the same batch of products and take the initial sample. 5.1.4 Sample collection for inspection
The initial sample taken is subjected to sensory inspection, weed and foreign matter determination, and then reduced to at least 1k by quartering method as the sample for inspection. 5.2 Sensory index detection method
5.2.1 Smell
Smell the smell close to the nose under normal conditions.
5.2.2 Color
Measure at a distance where the object can be seen most clearly under natural light. 5.2.3 Harvest period
Current storage period: buds appear on the grass, but no flowers have bloomed. Flowering period: 10% of the grass begins to bloom. Early fruiting period: 10% of the grass begins to fruit. Grain setting period: more than 50% of the muke enters the grain setting stage. 5.3 Physical and chemical index detection methods
5.3.1 Determination of moisture
According to the provisions of GI/T6135
NY/T15742007
5. 3.2 Determination of crude protein
According to the provisions of (B/T6432.
5.3.3 Determination of neutral detergent fiber
According to the provisions of GB/T20806
5.3.4 Acid detergent fiber
According to the provisions of NY/T 1459,
5.3.5 Determination of crude ash bzxZ.net
According to the provisions of (G13/T 6438 5.3.6 Determination of β-carotene 5.3.6.1 Determination principle Utilizing the difference in adsorption energy of adsorbents (such as MgO, Al2O3, CaO2, etc.) to different pigments, various pigments are separated step by step on the adsorption column, and then β-carotene with physiological effects that can be dissolved in solvents such as ether is separated from total carotene and other pigments (chlorophyll, flavin, chlorophyll) to perform colorimetric determination 5.3.6.2 Instruments and Chemical Reagents
Spectrophotometer, adsorption column (including column stand), balance (0.0001$), boron mortar, container, beaker, glass rod, ox-horn spoon, azobenzene (standard substance) or potassium dichromate (K.Cr:()) (standard substance), ethanol (analytical grade), acid-washed glass powder, lead oxide (analytical grade), petroleum ether (analytical grade).
5.3.6.3 Operation steps
5.3.6.3.1 Extraction and determination of β-carotene Weigh 5g~1Cg sample (accuracy 0.001g), grind it into a fine powder. Add 1 scoop of adsorbent oxide to the adsorption column and tighten it with glass birch to a moderate tightness. The adsorbent filling height is 5cm--6cm. Mix the ground sample with glass powder, transfer it to the adsorption column, and add petroleum ether: the petroleum ether should cover the sample completely so that the sample is not exposed to the air. Place the adsorption column in a dark kitchen to prevent the carotene from being oxidized. Add petroleum ether repeatedly until the droplets dripping from the bottom of the adsorption column are no longer yellow. Put the effluent into a 1m volumetric bottle, dissolve it with oil, and then measure it with an optical photometer. 5.3.6.3.2. Draw the curve of β-carotene standard solution. 3. Carotene standard solution can be prepared with azobenzene or potassium methionate. Preparation of azobenzene standard solution: Accurately weigh 0.145 g of azobenzene, add it into a 1000 mL volumetric flask, and make up to volume with 96% ethanol: the color of 1 mL of this solution is equivalent to the color of 0.002 35 mg 3-carotene in 1 ml solution. Preparation of potassium dichromate standard solution: Accurately weigh 3600 g of potassium dichromate and add 1000 mL of water. The color of 1 mL of potassium dichromate is equivalent to the color of 0.002 08 mg 9-carotene in 1 ml solution. Prepare five or more standard solutions of different concentrations, measure them on a spectrophotometer.1, and draw a standard solution curve. 5.3.6.3.3 Result calculation
On the standard solution curve, find out the concentration of the sample solution: Calculation: Carotene content (mg/kg) = r×y×1000/a Where:
- Carotene concentration in the sample, in milligrams per milliliter (mg/L); y - the fixed volume of carotene leached, in grams per liter
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